1992 Acura Legend Heator resister

Tiny
TONYACURA
  • MEMBER
  • 1992 ACURA LEGEND
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
92 Acura Legend - Heater would on work on High for past 2 years. Blower motor died and since replaced and it worked but still only on high. Last week recently stopped blowing on high and works intermitently after driving for awhile, but not always. Seen other forums suggest it might be Blower motor resister but can seem to find out if acura legend has that part or what the exact problem could be
Do you
have the same problem?
Yes
No
Thursday, November 19th, 2009 AT 8:15 PM

3 Replies

Tiny
KHLOW2008
  • EXPERT
Hi tonyacura,

The resistor for yur vehicle is known as power transistor.


http://www.2carpros.com/forum/automotive_pictures/192750_PowerTransistor92LegendFig13_1.jpg



It would affect other speeds but not the erratic on/off operations. Was the blower motor replaced new or used? When problem occurs, try giving the blower motor housing some banging to see if the motor starts working.
Was this
answer
helpful?
Yes
No
Friday, November 27th, 2009 AT 3:34 AM
Tiny
TONYACURA
  • MEMBER
Blower motor was new when installed and now blower is not working at all. Tried suggestion of banging with no avail.

My research indicates either power transitor, blower motor relay or blower motor high relay. Hoping not blower motor since just replaced (about 1 year ago).

Anyway to test which is the problem was leaning towards relay since worked on high before blower motor problems but don't want just to keep replacing parts by trial and error.
Was this
answer
helpful?
Yes
No
Friday, November 27th, 2009 AT 11:23 AM
Tiny
KHLOW2008
  • EXPERT
Yes, I never believed in replacing parts without testing and confirming that they are faulty.

Here are the diagnostic procedures.

BLOWER MOTOR DOES NOT RUN

1 . Check fuses No. 37 (40 -amp) and No. 19 (7.5 - amp). If fuses are okay, unplug connectors from blower relay and blower high relay. See Fig. 12 .


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor92LegendFig12_1.jpg



2 . Turn ignition on. Check for voltage between Black/Yellow wire in blower relay connector and chassis ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Black/Yellow wire between fuse No. 19 and blower relay.

3 . Check for voltage between Black/Yellow wire in blower high relay connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Black/Yellow wire between fuse No. 19 and blower high relay.

4 . Turn ignition off. Check for continuity between Black wire in blower high relay connector and ground. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Black wire between blower high relay and ground.

5 . Check for continuity between Black wire in blower relay connector and ground. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Black wire between blower relay and ground.

6 . Check for voltage between Blue/White wire in blower relay connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Blue/White wire between blower relay and fuse No. 37.

7 . Unplug blower motor 2 -pin connector, located near blower relays. Check for continuity in Blue/Red wire between blower relay connector and blower 2 -pin connector. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Blue/Red wire between blower relay and blower motor.

8 . Connect battery voltage to Blue wire in blower motor connector. Connect Black wire in blower motor connector to ground. If blower motor runs, go to next step. If blower motor does not run, replace motor.

9 . Connect ohmmeter leads to terminals "C" and "D" of blower motor relay. See Fig. 4 . If continuity does not exist, replace relay. If continuity exists, go to next step.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor92LegendFig04_1.jpg



10 . Connect ohmmeter to terminals "A" and "B" of relay. Connect terminal "C" to battery
voltage. Connect terminal "D" to ground. Relay should click and ohmmeter should indicate
continuity. If relay functions as specified, go to next step. If relay does not function as
specified, replace relay.

11 . Check Blue/Black wire for continuity between blower high relay and blower motor. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Blue/Black wire.

12 . Connect ohmmeter leads to terminals "C" and "D" of blower high relay. See Fig. 4 . If continuity does not exist, replace relay. If continuity exists, go to next step.

13 . Connect ohmmeter to terminals "A" and "B" of relay. Connect terminal "C" to battery voltage. Connect terminal "D" to ground. Relay should click and ohmmeter should indicate continuity. If relay functions as specified, go to next step. If relay does not function as specified, replace relay.

14 . Reconnect wiring to blower relay, blower high relay and blower motor. Remove A/C control unit. Turn ignition on. Using a jumper wire, connect Orange/White wire in A/C control unit 22 -pin connector to chassis ground. See Fig. 2 .


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor92LegendFig02_1.jpg



15 . If blower motor does not run, repair open circuit in Orange/White wire between control unit and blower high relay. If blower motor runs, install a known good control unit.

Was this
answer
helpful?
Yes
No
Friday, November 27th, 2009 AT 12:24 PM

Please login or register to post a reply.

Recommended Guides